/*
 * Used for hashing passwords to compare to hashed values in the database
 */
package epoverty;

import java.io.UnsupportedEncodingException; 
import java.security.MessageDigest; 
import java.security.NoSuchAlgorithmException;

public class SimpleSHA1
{

   private static String convertToHex(byte[] data)
   {
      StringBuffer buf = new StringBuffer();
      for (int i = 0; i < data.length; i++)
      {
         int halfbyte = (data[i] >>> 4) & 0x0F;
         int two_halfs = 0;
         do
         {
            if ((0 <= halfbyte) && (halfbyte <= 9))
            {
               buf.append((char) ('0' + halfbyte));
            } else
            {
               buf.append((char) ('a' + (halfbyte - 10)));
            }
            halfbyte = data[i] & 0x0F;
         } while (two_halfs++ < 1);
      }
      return buf.toString();
   }

   public static String SHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException
   {
      MessageDigest md;
      md = MessageDigest.getInstance("SHA-1");
      byte[] sha1hash = new byte[40];
      md.update(text.getBytes("iso-8859-1"), 0, text.length());
      sha1hash = md.digest();
      return convertToHex(sha1hash);
   }
}
